Ignite the charcoal in the Big Green Egg and heat, with the convEGGtor and the grid, to 130°C. Remove any skin from the tomahawk and scrape the ribs clean with a small knife, if necessary (or have the butcher do this).Place the Ribs and Roasting Rack in the Rectangular Drip Pan and then place the tomahawk on it. Place the Drip Pan on the grid and insert the Dual Probe Remote Thermometer pen into the core of the meat. Set the thermometer to 48°C. Close the lid of the EGG and leave the tomahawk to cook for approx. 4 hours until the set core temperature has been reached.Remove the Drip Pan with the Rack and the meat from the EGG. Remove the grid and use the Cast Iron Grid Lifter to place the Cast Iron Grid in the EGG. Heat the Big Green Egg to a temperature of 250°C. Cut between the ribs to divide the tomahawk into separate steaks.Place the tomahawk steaks on the grid and close the lid of the EGG. Turn the meat a quarter turn after approximately 1 minute and close the lid again. Flip the meat after another minute, and repeat to create a lovely grill pattern on both sides.Remove the tomahawk steaks from the EGG, and sprinkle with sea salt and freshly ground black pepper.